Other cyclists on my route are very rare; I probably only see another cyclist once a week or so, and 99% of the time they're going the other way. Every once in a while I see someone close to my ability going the same direction, but I don't really care then either. Most of the time they either are much faster or much slower than me. The people out for a casual ride at 10 MPH I just go on past. When the U of M cycling team appears in my rear-view mirror (couple of times a year, usually) I just hold the line and hope that I can get a few seconds of tailwind as they blow past me.